let rainbow_colours = ['#ff5454', '#ffa654', '#ffff5e', '#ceff9b', '#9dff96', '#a0f7d1', '#9bfbff', '#9bcdff', '#939eff', '#c493ff', '#faa8ff', '#ffa8d0'];
    let rainbow_current_colour = 0;
    setInterval(function(){
        if(rainbow_current_colour  >= (rainbow_colours.length - 1)){
            rainbow_current_colour = 0;
        }else{
            rainbow_current_colour++;
        }
    }, 1.5);